Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_fs: Fix epfile null pointer access after ep enable. A race condition occurs when ffs_func_eps_enable() runs concurrently with ffs_data_reset(). The ffs_data_clear() called in ffs_data_reset() sets ffs->epfiles to NULL before resetting ffs->eps_count to 0, leading to a NULL pointer dereference when accessing epfile->ep in ffs_func_eps_enable() after successful usb_ep_enable(). The ffs->epfiles pointer is set to NULL in both ffs_data_clear() and ffs_data_close() functions, and its modification is protected by the spinlock ffs->eps_lock. And the whole ffs_func_eps_enable() function is also protected by ffs->eps_lock. Thus, add NULL pointer handling for ffs->epfiles in the ffs_func_eps_enable() function to fix issues
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected c9fc422c9a43e3d58d246334a71f3390401781dc before b00d2572c16e8e59e979960d3383c2ae9cebd195; affected 0042178a69eb77a979e36a50dcce9794a3140ef8 before 1c0dbd240be3f87cac321b14e17979b7e9cb6a8f; affected 72a8aee863af099d4434314c4536d6c9a61dcf3c before 9ec40fba7357df2d36f4c2e2f3b9b1a4fba0a272; affected ebe2b1add1055b903e2acd86b290a85297edc0b3 before c53e90563bc148e4e0ad09fe130ba2246d426ea6; affected ebe2b1add1055b903e2acd86b290a85297edc0b3 before fc1141a530dfc91f0ee19b7f422a2d24829584bc; affected ebe2b1add1055b903e2acd86b290a85297edc0b3 before d62b808d5c68a931ad0849a00a5e3be3dd7e0019; affected ebe2b1add1055b903e2acd86b290a85297edc0b3 before 30880e9df27332403dd638a82c27921134b3630b; affected ebe2b1add1055b903e2acd86b290a85297edc0b3 before cfd6f1a7b42f62523c96d9703ef32b0dbc495ba4; affected 32048f4be071f9a6966744243f1786f45bb22dc2; affected cfe5f6fd335d882bcc829a1c8a7d462a455c626e; affected 3e078b18753669615301d946297bafd69294ad2c; affected 5.4.180 before 5.4.302; affected 5.10.101 before 5.10.247; affected 5.15.24 before 5.15.197; affected 4.14.267 before 4.15; affected 4.19.230 before 4.20; affected 5.16.10 before 5.17 |
| Linux / Linux | affected 5.17; unaffected 0 before 5.17; unaffected 5.4.302 through 5.4.*; unaffected 5.10.247 through 5.10.*; unaffected 5.15.197 through 5.15.*; unaffected 6.1.159 through 6.1.*; unaffected 6.6.117 through 6.6.*; unaffected 6.12.58 through 6.12.*; unaffected 6.17.8 through 6.17.*; unaffected 6.18 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/b00d2572c16e8e59e979960d3383c2ae9cebd195
- https://git.kernel.org/stable/c/1c0dbd240be3f87cac321b14e17979b7e9cb6a8f
- https://git.kernel.org/stable/c/9ec40fba7357df2d36f4c2e2f3b9b1a4fba0a272
- https://git.kernel.org/stable/c/c53e90563bc148e4e0ad09fe130ba2246d426ea6
- https://git.kernel.org/stable/c/fc1141a530dfc91f0ee19b7f422a2d24829584bc
- https://git.kernel.org/stable/c/d62b808d5c68a931ad0849a00a5e3be3dd7e0019
- https://git.kernel.org/stable/c/30880e9df27332403dd638a82c27921134b3630b
- https://git.kernel.org/stable/c/cfd6f1a7b42f62523c96d9703ef32b0dbc495ba4